You didn't include jack stands, crawling under the car, nor needing an appropriate place to work in your original description making it sound so easy. I do a lot of DIY including car stuff, but for oil it's a toss up of whether I actually want that hassle or whether I'll just outsource it to a still-competitive market for a low price.
(I did get burned on a cross country road trip by some dipshit stripping my oil pan drain hole. I don't know if they just didn't like the far-off plates, or aluminum was an exotic material to them, or what. But that's much less of a worry when you go to the same local place)
Depends on your car but you don't need to jack it up for oil. I do it whereever its parked. I've done it on the side of the road when I had to park it there before.
(I did get burned on a cross country road trip by some dipshit stripping my oil pan drain hole. I don't know if they just didn't like the far-off plates, or aluminum was an exotic material to them, or what. But that's much less of a worry when you go to the same local place)